Brn-4 Assembled Upper Receivers - Brn-4 10.4'''' Assembled Upper Receiver Heavy Barrel

Assembled from All New Components - Fits Standard AR-15 Lowers The BRN-4 Upper Receiver is now available as an Assembled Upper, with Barrel and Gas System installed. Simply add your preferred HKA(R) 416 compatible handguard and any 1/2-28 muzzle device, and you're ready to hit the range! Built from the ground up, the core of the BRN-4 Upper Receiver is an all new Bolt Carrier Group, featuring a slick nitride finish. The new BRN-4 barrel, produced by Faxon, is available in a variety of profiles and lengths to suit your needs. Barrels are chambered 5.56x45mm NATO, are button rifled with a 1-7 twist, 1/2-28 muzzle and come with the appropriate gas block for a given bar Mfg: Brownells